The use of th Frenchified suffix “-ous” instead of the first declension masc. noun nominative form “-us” is something that always catches my eye. The “-ous” is a truncation of the Latin “-osis” which, when appended to a word means “full of” whatever the word signifies. So, since Caligula, translates, as most people know, as “Little Boots”, “Caligulous” would be a French or English word meaning “full of Little Boots.” 🥾🥾
But most people, having no familiarity with Latin, are like Trump. However…